You can make the swap w/o issue. You will need to plug the EGR port on your intake if you don't plan on re-installing it. I just made the switch to 4 piece manfilds and timevalve down pipes on my coupe and I Love it..!

You can have a look at the pics on my site below.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta